%%
%% The LaTeX Companion, 3ed
%%
%% Example 7-4-11 on page I-553 in "subcaption --- Substructuring floats".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{207.0pt}

%StartShownPreambleCommands
\usepackage{graphicx,subcaption}
%StopShownPreambleCommands

\begin{document}
\begin{figure}
  \centering
  \begin{minipage}{3cm} \centering
    \includegraphics{cat}
    \subcaption{Small}
  \end{minipage}
  \begin{minipage}{3cm}
    \includegraphics[width=3cm]{elephant}
    \subcaption{Large}
  \end{minipage}
  \caption{Exercising manual control}
\end{figure}
\end{document}